linux-hardening - Re: [PATCH] firmware: ti_sci: refactor deprecated strncpy

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Date:   Fri, 15 Sep 2023 07:40:38 -0500
From:   Nishanth Menon <nm@...com>
To:     Kees Cook <keescook@...omium.org>
CC:     Justin Stitt <justinstitt@...gle.com>,
        Tero Kristo <kristo@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] firmware: ti_sci: refactor deprecated strncpy

On 21:03-20230914, Kees Cook wrote:
> On Wed, Sep 13, 2023 at 08:23:02PM +0000, Justin Stitt wrote:
> > `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> > 
> > We should prefer more robust and less ambiguous string interfaces.
> > 
> > A suitable replacement is `strscpy` [2] due to the fact that it guarantees
> > NUL-termination on the destination buffer.
> > 
> > It does not seem like `ver->firmware_description` requires NUL-padding
> > (which is a behavior that strncpy provides) but if it does let's opt for
> > `strscpy_pad()`.
> > 
> > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> > Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> > Link: https://github.com/KSPP/linux/issues/90
> > Cc: linux-hardening@...r.kernel.org
> > Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> 
> Looks right to me.
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>

Does this belong to stable as well? If so, please add appropriate stable
process.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D